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 Forum index » DIY Hardware and Software » YuSynth
Yusynth VCO
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Alexandr



Joined: Feb 05, 2008
Posts: 5
Location: Russia

PostPosted: Tue Feb 05, 2008 8:51 pm    Post subject: Yusynth VCO
Subject description: question about power some IC's
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Hello! Synthesizers fan and makers.

First.Sorry about my "bad" english.i dont study it a lot.

So.Yusynth VCO have some IC's like LM311 and OPA2137 powered by stabilized +\-15v.Thats mean - on 78L15\79L15 need ower +\-15 input voltages.Thats not good concept for me.
So my question - does VCO will work fine if im replace 7xL15 with - 7xL10 or 7xL05 ?

And btw does anybody know how stable Yusynth VCO are if:we use precision matched pair on exp.conv. like MAT02 ?
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yusynth



Joined: Nov 24, 2005
Posts: 1229
Location: France

PostPosted: Wed Feb 06, 2008 3:28 am    Post subject: Reply with quote  Mark this post and the followings unread

I have already answered to that question before (but not on this forum therefore you're welcome to ask Wink ).

In the Yusynth VCO the aim of these regulators is not achieving an exact 15V regulation. As a matter of fact there is a drop of nearly 1.3 to 1.6V in the present design. My aim was to have a stabilized voltage and to isolate the powering of the sensitive ICs.

It is commonly assumed that the 78xx and 79xx won't do the job if not fed with a voltage 3V higher than the expected output voltage but you must bear in mind that this 3V overhead announced on the datasheet is when the regulator IC works close to its highest current draw condition. For lower current draws this is not necessary (check the Dropout characteristic curves on the datasheet). In the condition of operation of the yusynth VCO we are far bellow this current draw and the drop is lesser.

By the way I had a report from somebody who actually built it without the regulators and the circuit would not work. But when he eventually used the regulators as designed the VCO started to work as expected.

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Yves
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